Any trade can go there, no special knowledge is needed to be a kitchen General Duties (Helper).
I recall seeing FireFighters, Cooks, a Clerk, some Airforce Radar types and Army Signals.
Also depends on Rank, like a Sgt Supply or MS Steward.
There's a case manager in Ottawa that handles the military tours up there. Summit a memo and hope your CoC support it and get it to her.
Keep in mind a lot of people also want alert so good luck.
I tired for a few years to get there myself, went I finally got there it was in support of an exercise and only for one month.